Messages in this thread | | | Subject | Re: BUG: receive list entry not found for dev vxcan1, id 002, mask C00007FF | From | Oliver Hartkopp <> | Date | Wed, 25 Nov 2020 21:54:29 +0100 |
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Hi Dmitry,
On 25.11.20 19:48, Dmitry Vyukov wrote: > On Wed, Nov 25, 2020 at 5:04 PM Oliver Hartkopp <socketcan@hartkopp.net> wrote:
>> This seems to be very seldom but it does not break anything. >> >> Would removing the WARN(1) or replacing it with pr_warn() be ok to close >> this issue? >
> Yes, this is the intended way to deal with this: > https://elixir.bootlin.com/linux/v5.10-rc5/source/include/asm-generic/bug.h#L75 > > Maybe a good opportunity to add some explanatory comment as well > regarding how it should not happen but can. I already prepared a patch for it which has indeed 90% explanatory comment ;-)
Will send out a patch tomorrow after collecting all the three/four? syskaller bug IDs that popped up with this issue :-D
Many thanks! Oliver
> > > > >> On 23.11.20 12:58, syzbot wrote: >>> Hello, >>> >>> syzbot found the following issue on: >>> >>> HEAD commit: c2e7554e Merge tag 'gfs2-v5.10-rc4-fixes' of git://git.ker.. >>> git tree: upstream >>> console output: https://syzkaller.appspot.com/x/log.txt?x=117f03ba500000 >>> kernel config: https://syzkaller.appspot.com/x/.config?x=75292221eb79ace2 >>> dashboard link: https://syzkaller.appspot.com/bug?extid=381d06e0c8eaacb8706f >>> compiler: gcc (GCC) 10.1.0-syz 20200507 >>> >>> Unfortunately, I don't have any reproducer for this issue yet. >>> >>> IMPORTANT: if you fix the issue, please add the following tag to the commit: >>> Reported-by: syzbot+381d06e0c8eaacb8706f@syzkaller.appspotmail.com >>> >>> ------------[ cut here ]------------ >>> BUG: receive list entry not found for dev vxcan1, id 002, mask C00007FF >>> WARNING: CPU: 1 PID: 12946 at net/can/af_can.c:546 can_rx_unregister+0x5a4/0x700 net/can/af_can.c:546 >>> Modules linked in: >>> CPU: 1 PID: 12946 Comm: syz-executor.1 Not tainted 5.10.0-rc4-syzkaller #0 >>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 >>> RIP: 0010:can_rx_unregister+0x5a4/0x700 net/can/af_can.c:546 >>> Code: 8b 7c 24 78 44 8b 64 24 68 49 c7 c5 20 ac 56 8a e8 01 6c 97 f9 44 89 f9 44 89 e2 4c 89 ee 48 c7 c7 60 ac 56 8a e8 66 af d3 00 <0f> 0b 48 8b 7c 24 28 e8 b0 25 0f 01 e9 54 fb ff ff e8 26 e0 d8 f9 >>> RSP: 0018:ffffc90017e2fb38 EFLAGS: 00010286 >>> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 >>> RDX: ffff8880147a8000 RSI: ffffffff8158f3c5 RDI: fffff52002fc5f59 >>> RBP: 0000000000000118 R08: 0000000000000001 R09: ffff8880b9f2011b >>> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002 >>> R13: ffff8880254c0000 R14: 1ffff92002fc5f6e R15: 00000000c00007ff >>> FS: 0000000001ddc940(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 >>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>> CR2: 0000001b2f121000 CR3: 00000000152c0000 CR4: 00000000001506e0 >>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >>> Call Trace: >>> isotp_notifier+0x2a7/0x540 net/can/isotp.c:1303 >>> call_netdevice_notifier net/core/dev.c:1735 [inline] >>> call_netdevice_unregister_notifiers+0x156/0x1c0 net/core/dev.c:1763 >>> call_netdevice_unregister_net_notifiers net/core/dev.c:1791 [inline] >>> unregister_netdevice_notifier+0xcd/0x170 net/core/dev.c:1870 >>> isotp_release+0x136/0x600 net/can/isotp.c:1011 >>> __sock_release+0xcd/0x280 net/socket.c:596 >>> sock_close+0x18/0x20 net/socket.c:1277 >>> __fput+0x285/0x920 fs/file_table.c:281 >>> task_work_run+0xdd/0x190 kernel/task_work.c:151 >>> tracehook_notify_resume include/linux/tracehook.h:188 [inline] >>> exit_to_user_mode_loop kernel/entry/common.c:164 [inline] >>> exit_to_user_mode_prepare+0x17e/0x1a0 kernel/entry/common.c:191 >>> syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266 >>> entry_SYSCALL_64_after_hwframe+0x44/0xa9 >>> RIP: 0033:0x417811 >>> Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 a4 1a 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 >>> RSP: 002b:000000000169fbf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 >>> RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000417811 >>> RDX: 0000000000000000 RSI: 00000000000013b7 RDI: 0000000000000003 >>> RBP: 0000000000000001 R08: 00000000acabb3b7 R09: 00000000acabb3bb >>> R10: 000000000169fcd0 R11: 0000000000000293 R12: 000000000118c9a0 >>> R13: 000000000118c9a0 R14: 00000000000003e8 R15: 000000000118bf2c >>> >>> >>> --- >>> This report is generated by a bot. It may contain errors. >>> See https://goo.gl/tpsmEJ for more information about syzbot. >>> syzbot engineers can be reached at syzkaller@googlegroups.com. >>> >>> syzbot will keep track of this issue. See: >>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. >> To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com. >> To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/b134c098-2f34-15ee-cfec-2103a12da326%40hartkopp.net.
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